9results about How to "Reduced catalytic efficiency" patented technology

The invention relates to a copper-based catalyst for hydrogen production through methanol cracking and a preparation method of the copper-based catalyst, and belongs to the technical field of hydrogen production through methanol cracking, and the preparation method of the copper-based catalyst for hydrogen production through methanol cracking comprises the four steps of nano zirconium phosphate modification, preparation of nano zirconium phosphate-copper manganese zinc oxide, preparation of copper aluminum zirconium gel and aftertreatment. The copper oxide content of the obtained copper-based catalyst for hydrogen production through methanol cracking is 7.5-14.3 wt%, the initial performance is that the methanol conversion rate is 97.1-98.2%, the hydrogen selectivity is 98.2-98.9%, the CO content in reformed tail gas is 0.11-0.17%, and the heat-resistant performance is that the methanol conversion rate is 96.5-97.7%, the hydrogen selectivity is 97.6-98.3%, and the CO content in the reformed tail gas is 0.15-0.19%.

The invention relates to the technical field of biosynthesis, in particular to a preparation method of gamma-aminobutyric acid. The invention provides a method for preparing gamma-aminobutyric acid, according to the method, gamma-aminobutyric acid is catalytically synthesized by using a mutant of glutamate decarboxylase screened by the inventor, the problems of low catalytic efficiency, long conversion time and limited reuse times of enzyme are solved, the immobilized enzyme can be continuously subjected to at least 20 rounds of enzyme catalytic reaction, and the yield of gamma-aminobutyric acid is increased. And moreover, the catalytic efficiency is not obviously reduced, the substrate conversion rate can still be stabilized at 99% or above, and the method is suitable for industrial production.

The application discloses a catalyst for catalytic combustion of chlorine-containing organic matters and a preparation method and application thereof, and belongs to the technical field of environmental protection catalysts. In the application, the composite oxide active component is loaded on a molecular sieve through an impregnation method, and then the noble metal active component is adsorbed on the surface of the composite oxide active component through an electrostatic adsorption method, so that the noble metal is stabilized by using the strong interaction between the noble metal and the oxide, the utilization rate of the noble metal catalyst is improved, the activity and stability of the catalytic combustion of the chlorine-containing organic waste gas are improved, and the industrialization of the treatment of the chlorine-containing volatile organic matters by the catalytic combustion has important significance.

The invention provides a mutant of soybean lipoxygenase LOX2 and application of the mutant in creation of fishy-smell-free soybeans, the mutant is based on a parent amino acid sequence of SEQ ID NO.1, succinylation modification is introduced into lysine residues at the 257th site, the 263rd site and the 472th site, the catalytic efficiency of LOX2 is reduced, oxidation of polyunsaturated fatty acid is reduced, and the yield of the soybean lipoxygenase LOX2 is increased. And the fishy-smell-free soybeans are effectively prepared. Compared with a wild type, the catalytic efficiency is reduced by 15.62%, and a new basis is provided for food industrial application. In addition, molecular transformation is realized through a grafting breeding technology, the soybean quality is improved, the production cost is remarkably reduced, and the method has important significance on soybean variety improvement and grease quality improvement.

The present invention relates to the field of polymer technology, and specifically discloses a method for producing polyethylene wax using high-density polyethylene. The method for producing polyethylene wax using high-density polyethylene comprises: putting high-density polyethylene, ferroferric oxide-modified montmorillonite, and a solvent into a plastic extruder, adjusting the temperature and screw speed of each area of ​​the plastic extruder, and finally obtaining a powdered polyethylene wax through high-speed spraying, cooling, and magnetic attraction. The preparation method of the present invention also has the advantages of being simple, convenient, and easy to industrialize.

The invention relates to the technical field of solid biomass waste recycling and biomass activated carbon preparation, in particular to a perovskite active agent loaded coconut shell activated carbon composite material and a preparation method and application thereof. The preparation method of the perovskite active agent loaded coconut shell activated carbon composite material comprises the following steps: preparing coconut shell activated carbon by taking coconut shell as a raw material; laCo (1-x) MnxO3 is prepared, the molar ratio of lanthanum to cobalt to manganese is 1: (1-x): x, and x is 0-1; and loading LaCo < 1-x > Mn < x > O < 3 > on the coconut shell activated carbon to obtain the perovskite active agent loaded coconut shell activated carbon composite material. According to the preparation method, the problems that in the prior art, extra electrification is needed for electrolysis, the raw material proportion requirement is high, the proportion is complex, and the method is not suitable for large-scale industrial production are solved, efficient absorption of the harmful dye malachite green in the printing and dyeing wastewater is achieved, and the preparation method has important research significance and environment-friendly application value.

The invention discloses a method for removing dioxins from kiln exhaust gas, which relates to the technical field of exhaust gas treatment. Zinc-containing waste is recycled in a rotary kiln; the exhaust gas in the rotary kiln flows to: kiln head-high temperature section-medium temperature section-low temperature section-waste heat boiler-bag-desulfurization-chimney discharge; a dioxin inhibitor is sprayed into the kiln head, and the dioxin inhibitor includes at least one of modified diatomaceous earth, sulfur or sulfide-containing compounds, ammonium-containing compounds and calcium-containing inorganic substances. The invention greatly reduces dioxins when they are discharged by adding a dioxin inhibitor into the kiln head.

The application relates to the technical field of organic synthesis, in particular to a preparation method of biphenol, wherein under visible light irradiation, biphenyl, a catalyst, acetonitrile and hydrogen peroxide are mixed and reacted, then filtered, the obtained filtrate is distilled, and the product is collected, so that the biphenol is prepared; the catalyst is a rare earth doped transition metal organic framework microsphere, the method has mild reaction conditions, is easy to operate, no toxic waste liquid is generated, and a new idea is provided for the preparation of the biphenol.

The utility model relates to the technical field of denitration equipment, in particular to a sound wave device for a denitration catalyst layer, which comprises a machine shell, a first groove is arranged on the outer wall of the machine shell, a second groove is arranged on the side wall of the first groove, and a sound wave mechanism is arranged on the outer wall of the machine shell. One end of the sound wave main body is fixedly connected with a loudspeaker, the interior of the sound wave main body is movably connected with a diaphragm, the other end of the sound wave main body is fixedly provided with a breathing port, the outer wall of the sound wave main body is fixedly connected with a fixing block, and the lower surface of the fixing block is fixedly provided with a connecting column; and a first baffle is fixedly installed at the other end of the connecting column, a limiting plate is fixedly installed on the outer wall of the connecting column, and a second baffle is movably connected to the outer wall of the connecting column. The sound wave device is reasonable in structure, the whole sound wave device can be detached, regular cleaning and fault replacement are facilitated, and the service life of the sound wave device can be prolonged.