8 results about "Catalyst degradation" patented technology

The present invention provides a catalyst regeneration apparatus and a catalyst regeneration method that can regenerate a degraded catalyst while suppressing a decrease in production efficiency during the production of a predetermined product. [Solution] A catalyst regeneration device for a reactor 3 that produces a predetermined product by catalytic action of catalysts in each reaction tube 2 using a plurality of reaction tubes 2, each filled with catalyst C, while continuing to introduce the raw material gas, the device comprises a catalyst degradation detection unit for detecting whether or not the catalyst C in each of the plurality of reaction tubes 2 has deteriorated, a regeneration gas supply unit 6 capable of supplying a predetermined regeneration gas to each reaction tube 2 for regenerating the deteriorated catalyst C, and a control unit 7 that controls the regeneration gas supply unit to supply regeneration gas to the reaction tube 2 having a catalyst C that has been detected to have deteriorated based on the detection results from the catalyst degradation detection unit.

Catalyst regeneration equipment for regenerating a catalyst that has been degraded due to a catalytic action, while a predetermined source gas is being continuously introduced, in a reactor including a plurality of reaction tubes each being filled with the catalyst, the reactor generating a predetermined product through the catalytic action of the catalyst in each of the plurality of reaction tubes, the catalyst regeneration equipment including: a catalyst degradation detection unit configured to detect presence or absence of degradation of the catalyst in every one of the plurality of reaction tubes; a regeneration gas supply unit capable of supplying a predetermined regeneration gas for regenerating a degraded catalyst to every one of the plurality of reaction tubes; and a controller configured to control the regeneration gas supply unit to supply the regeneration gas to a reaction tube including the catalyst in which the degradation has been detected, based on a detection result by the catalyst degradation detection unit.

This invention relates to a method for preparing and applying a metal atom-supported reduced graphene oxide catalyst, specifically a method for preparing and applying a metal atom-supported reduced graphene oxide catalyst. The invention aims to address the technical problems of high energy consumption, high cost, and easy secondary pollution associated with existing catalysts for the degradation of organic pollutants. This invention involves in-situ growth of transition metals on the GO surface to dope the ZIF-8 precursor, effectively improving the interfacial bonding between the precursor and the carbon support, and preventing the loss or migration of active components during subsequent pyrolysis. During pyrolysis and carbonization, the M-ZIF-8 precursor decomposes to form a nitrogen-containing carbon framework, and the transition metal species are supported on the reduced graphene oxide support in an atomically dispersed or highly dispersed form. The resulting catalyst possesses abundant active sites and excellent electron transport properties, and can be applied in electrocatalysis and the degradation of organic pollutants.

This invention proposes an AOP water-catalyst degradation and separation food purification machine, belonging to the field of food purification machines. The invention includes a purification machine component, a draining component installed vertically within the purification machine component, a circulation component located at the rear of the purification machine component for circulation, and a drainage component for drainage. The purification machine component includes: a purification chamber; a vertical partition fixed in the middle of the purification chamber; and horizontal support plates welded to the left and right sides of the vertical partition, the horizontal support plates dividing the purification chamber into a cleaning chamber and a return water chamber. The draining component includes: a drain basket body located above the horizontal support plates; and the drainage component. This invention, through the drainage component, simultaneously pushes the entire drain basket body upwards during drainage. When the drain basket body is removed, the water level in the cleaning chamber simultaneously decreases, thereby preventing wastewater from splashing out when the drain basket body is removed.

The present invention aims to provide a method for producing olefins using waste plastic raw materials, which enables sufficient catalyst regeneration while suppressing catalyst degradation. [Solution] A method for producing olefins, comprising: a thermal decomposition step of thermally decomposing a waste plastic raw material containing polyolefin to obtain a hydrocarbon flow; a crude olefin production step of supplying the hydrocarbon flow to a catalytic cracking apparatus that decomposes hydrocarbons by contacting a catalyst containing zeolite with hydrocarbons to obtain crude olefins; a separation step of separating olefins having 2 to 4 carbon atoms from the crude olefins; a hot air generation step of generating hot air containing oxygen gas using a hot air generator; and a catalyst regeneration step of supplying the hot air to a catalyst regeneration apparatus that regenerates a catalyst by heating, regenerating the catalyst used in the crude olefin production step with the hot air, and returning the regenerated catalyst to the catalytic cracking apparatus.

The current invention describes the synthesis of heterogeneous composite comprising laponite and heptamolybdate by wetness impregnation method. Different experimental settings were used to carry out the synthesis, including the heptamolybdate ammonium dose (1.5, 1 or 0.5 g), ion exchanger dose tetrabutyl ammonium bromide (0.5, 0.25 or 0.125g), reaction duration (12 or 24h) and calcination temperature (200, 300 and 400 °C) for 2 hours. The optimal synthesis composition of the laponite / molybdate (Lap-Mo) is as follows: 5 g of Lap + 0.5 g of TBA + 1.5 g of heptamolybdate ammonium with reaction duration of 24 h and a calcination temperature of 300 °C for 2 hours under air. The laponite / molybdate composite have been used in an AOP to degrade MB dye in presence of H2O2 as an oxidant under visible light radiation. The AOP experiment have been optimized using RSM based on BBD. Under the optimum conditions: contact time=72 min, [H2O2 / Lap-Mo] wt% ratio= 1.24, dye concentration= 20.95 mg.L-1 pH= 8.3 reaching a 99% of degradation rate. The Lap-Mo catalyst degradation efficiency was also tested for other dyes such as safranin T (ST) and rhodamine B (RhB) as cationic dyes and methyl orange (MO) as anionic dye. Indeed, they exhibits a highly degradation rate equal to 96, 90 and 89% for ST, RhB and MO, respectively. Advantageously, the invention intends to promote, profitably, and efficiently dye degradation using the laponite / molybdate composite. Furthermore, the potential of the invention falls within the framework of improving wastewater treatment and paves the way to more areas of application in multiple industries.

This invention provides a catalyst degradation diagnosis device and method that eliminates the need for floating-point calculations, enabling catalyst degradation diagnosis through simple calculations. The catalyst degradation diagnosis device includes: a catalyst disposed in the exhaust passage of an internal combustion engine; an upstream oxygen concentration detection unit disposed upstream of the catalyst; a downstream oxygen concentration detection unit disposed downstream of the catalyst; an upstream determination counting unit that counts the number of upstream determinations; and a downstream determination counting unit that counts the number of downstream determinations. When the number of upstream determinations in the upstream determination counting unit reaches a predetermined number, a catalyst degradation index value is calculated using the upstream and downstream determination counts. The counts in the upstream and downstream determination counting units are then reset. Catalyst degradation is diagnosed by comparing the catalyst degradation index value with a catalyst degradation index threshold.

According to an aspect, a concentration of H2 in O2 released from one or more anode compartments of an electrolyzer is measured. It is checked whether the measured concentration exceeds a predefined threshold. If the concentration exceeds the predefined threshold, a mixture of water and a secondary gas is injected into the anode compartments. The injected mixture dilutes any H2 gas present in the anode compartments so as to keep a level of the H2 gas within safe limits (thereby avoiding the formation of explosive mixtures). According to another aspect, a determination of whether the electrolyzer is in a standby or a shutdown mode is performed. In response to the determination, a minimal flow of the secondary gas is periodically introduced into the anode compartments, so as to keep a level of the residual H2 gas within safe limits (thereby preventing the degradation of the catalysts).