110results about How to "Increase lytic activity" patented technology

A catalyst for purifying the exhaust gases of diesel engines, which catalyst contains at least one zeolite and, additionally, at least one of the support oxides aluminum oxide, silicon dioxide, titanium dioxide and aluminum silicate and at least one of the noble metals platinum, palladium, rhodium and iridium. In this catalyst the atoms of the noble metals have a mean oxidation number of less than +2.5, on average more than 3 metal ligands and less than 3 oxygen ligands and are present on the zeolites and support oxides in the form of crystallites having a mean particle size of from 1 to 6 nm.

The invention discloses a catalyst for pyrolysis of oil shale. The catalyst is prepared from the following raw materials by weight percentage: 2-8% of a molecular sieve, 1-5% of activated clay, 10-60% of organic cobaltate, 5-20% of metal sulfide, 8-30% of glycerate, and 15-35% of paraffin; the organic cobaltate is one or more of cobalt acetate, cobalt oxalate, cobalt naphthenate and cobalt neocaprate; the metal sulfide is molybdenum sulfide and / or nickel sulfide. The invention further discloses a preparation method of the catalyst and a use method of the catalyst. According to the catalyst disclosed by the invention, the pyrolysis efficiency of the oil shale can be improved, the distribution of pyrolysis products of the oil shale is improved, more light products are produced, and components of gasoline and diesel oil can be separated through rectification. According to the preparation method and use method of the catalyst, which are disclosed by the invention, the catalytic pyrolysis and microwave heating are combined, so that the utilization efficiency of energy source can be improved, the composition and process performance of liquid fuel are improved, and the following processing difficulty is reduced.

A method for producing a catalyst for catalytic cracking of a hydrocarbon oil easily produces a catalyst for catalytic cracking of a hydrocarbon oil that exhibits high cracking activity with respect to a heavy hydrocarbon oil, and can produce a gasoline fraction having a high octane number in high yield. The method includes preparing an aqueous slurry that includes 20 to 50 mass % of a zeolite having a sodalite cage structure, 10 to 30 mass % (on a SiO2 basis) of a silica sol, 0.1 to 21 mass % (on an Al2O3.P2O5 basis) of mono aluminum phosphate, and 5 to 65 mass % of a clay mineral on a solid basis, aging the aqueous slurry for 5 to 200 minutes, and spray-drying the aqueous slurry.

The invention discloses a rhodium reduction activation dissolution method, and relates to the technical field of noble metal metallurgy. The rhodium reduction activation dissolution method can be used for overcoming the defects of the prior art and aims at achieving a rhodium dissolution method which has the advantages of high dissolution efficiency, wet method normal-pressure dissolution, easiness for operation, short process flow, low production cost and wide rhodium waste dissolution range. The technical scheme is as follows: the rhodium reduction activation dissolution method comprises the following steps of: A, crushing and grinding rhodium wastes; B, mixing with an activating agent; C, carrying out acid-soluble activation; D, filtering; and E, dissolving. According to the invention, because zinc powder and a hydrochloric acid solution generate chemical reaction in the step C to generate H2, rhodium oxide contained in the solution can be reduced into metal rhodium through H2 at 100 DEG C, the dissolution activity of rhodium can not be reduced and can be enhanced so as to be favorable to subsequent dissolution, and the rhodium oxide is reduced into the metal rhodium without being dissolved by hydrochloric acid in the activated process. Thus, the rhodium reduction activation dissolution method disclosed by the invention has the advantages of high rhodium dissolution efficiency, rhodium normal-pressure dissolution, low dissolution temperature, easiness for operation, short process flow, low production cost and wide rhodium waste dissolution range.

The invention provides a dinuclear macrocyclic polyamine metal complex. It is uses as hydrolyst, able to effectively cut DNA and RNA on physiological condition at low concentration (the minimum value 5mu mol / L) in short time (hydrolyzing time about 30 minutes), it has good cutting reaction selectivity, no notch ringlike DNA and RNA occurring, and its cutting mode is also similar to restriction endonuclease's.

Provided is a catalyst for hydrocracking a paraffinic hydrocarbon which provides satisfactorily high cracking activity and middle fraction yield as well as the low pour point of the fuel base material (the middle fraction) all together. The catalyst of the present invention comprises a USY zeolite derived from NaY used as the raw material and having a peak intensity of 30 or lower, appearing on the 111 surface upon X-ray diffraction, and a noble metal of Group VIII of the periodic table.

Ethanol losses due to bacterial contamination in fermentation cultures weakens the economics of biofuel production. Lactobacillus species are the predominant contaminant. Bacteriophage lytic enzymes are peptidoglycan hydrolases which degrade Gram positive cell walls when exposed externally and are a novel source of antimicrobials. The streptococcal phage λSA2 endolysin construct demonstrated strong lytic activity towards 17 of 22 strains of lactobacilli, staphylococci or streptococci maintaining optimal specific activity under fermentation conditions toward L. fermentum substrates. Lactobacillus bacteriophage endolysin constructs LysA, LysA2 and LysgaY showed exolytic activity towards ˜60% of the lactobacilli tested including four L. fermentum isolates from fuel ethanol fermentations. Presence of ethanol (≦5%) did not affect lytic activity. Lysins were able to reduce both L. fermentum and L. reuteri contaminants in mock fermentations of corn fiber hydrolysates. Recombinant LysA and λSa2 expressed in the yeast Saccharomyces cerevisiae are functional; LysA was shown to reduce lactobacilli in experimentally infected fermentations.

The present invention provides a cracking catalyst, containing a rare-earth Y-zeolite and a support, which is characterized in that the rare-earth content in crystal lattice of the rare-earth Y-zeolite is 4-15 wt % of RE2O3; the original unit cell size is 2.440-2.465 nm; the equilibrium unit cell size of the catalyst after 100% steam-aging treatment at 800° C. for 17 hours is larger than 2.435 nm; the rare-earth atom content in the support is 1.0-8.0 wt % of the support. The present invention also relates to a preparation process for the same catalyst.

Novel catalytic compositions for cracking of crude oil fractions are disclosed. The catalytic compositions comprise a basic material. When used in a cracking process, preferably a FCC process, the resulting LCO and HCO fractions have desirably low aromatics levels. Further disclosed is a one-stage FCC process using the catalytic composition of the invention. Also disclosed is a two-stage FCC process for maximizing the LCO yield.

The present invention relates to a Salmonella bacteriophage, in particular to a Siphoviridae bacteriophage with a wide host spectrum and a strong lytic activity against Salmonella pullorum. The above-mentioned Salmonella pullorum bacteriophage is named SP4, and is deposited at the China General Microbiological Culture Collection Center, the deposit date is Jul. 27, 2017 and the deposit number is CGMCC No, 14332, The bacteriophage has a strong lysis effect on Salmonella, and the bacteriophage can also reduce the mortality rate of chicks infected with Salmonella pullorum, The preparation can be used alone or as a cocktail, and provides a safe, non-toxic and side-effect-free and residual effect-free bacteriophage product for the treatment of the infections caused by Salmonella of chicken origin, Salmonella of duck origin, Salmonella of mink origin, Salmonella of food origin and Salmonella of pig origin.

The invention discloses a preparation method for a catalyst used in production of isobutene through cracking of methyl tert-butyl ether (MTBE). According to the method, silica gel, alumina gel and Silicalite-1 molecular sieve crystallization liquid are mixed and molded and then undergo hydro-thermal treatment, and a resultant is used as the catalyst; preferably, the catalyst is loaded with a proper amount of active metal components; and the catalyst is used for cracking of MTBE for production of isobutene. The catalyst prepared in the invention has good catalysis performance, enables good selectivity on methanol and isobutene and a high conversion rate of MTBE to be obtained and inhibits generation of dimethyl ether, a reaction by-product.