Abstract:
PROBLEM TO BE SOLVED: To provide a catalyst carrier which has a huge effect in process efficiency as an ethylene epoxidation catalyst.SOLUTION: The carrier comprises alumina and/or a bond material, and has a surface area of at least 1 m/g and a total pore volume and a pore size distribution such that: at least 80% of the total pore volume is contained in pores with diameters in the range of from 0.4 to 10 μm; and at least 80% of the pore volume contained in the pores with diameters in the range of from 0.1 to 10 μm is contained in pores with diameters in the range of from 0.3 to 10 μm. Also, the process for the preparation of a carrier comprises: a step of forming a mixture comprising (a) a first particulate α-alumina having a median particle size (d) of from 5 to 100 μm, (b) a second particulate α-alumina having a dwhich is less than the dof the first particulate α-alumina and which is in the range of from 1 to 10 μm, and (c) an alkaline earth metal silicate bond material; and a step of firing the mixture to form the carrier.
Abstract:
PROBLEM TO BE SOLVED: To provide a catalyst carrier useful in epoxidation of olefins. SOLUTION: It has been found that the selectivity and the activity of a silver catalyst for epoxidation of olefins are a function of the distribution of the pore diameter of an alumina carrier on which the catalyst is deposited. It has been also found that a carrier having a water absorption coefficient of 35 to 55%, a surface area of at least 1.0 m 2 /g and a minimum number of pores of very large size (larger than 10 μm) is especially advantageous. A production method for such catalysts is also disclosed. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a process for preparing a catalyst carrier, which can keep the high level of selectivity when olefin oxide is produced by reacting olefin with oxygen.SOLUTION: The process for the preparation of a carrier comprises: a step of forming a mixture comprising (a) from 50 to 95 weight percent of a first particulate α-alumina having a median particle size (d) of from 5 to 100 mum, (b) from 5 to 50 weight percent of a second particulate α-alumina having a dwhich is less than the dof the first particulate α-alumina and which is in the range of from 1 to 10 μm, and (c) an alkaline earth metal silicate bond material, weight percent being based on the total weight of α-alumina in the mixture; and a step of firing the mixture to form the carrier.
Abstract:
PROBLEM TO BE SOLVED: To provide a catalyst carrier which can keep the high level of selectivity during the production of olefin oxide by oxidization of olefin.SOLUTION: The carrier, which comprises non-platelet alumina and/or a bond material, has a surface area of at least 1 m/g, a total pore volume and a pore size distribution such that at least 80% of the total pore volume is contained in pores with diameters in the range of from 0.4 to 10 μm, and at least 80% of the pore volume contained in the pores with diameters in the range of from 0.1 to 10 μm is contained in pores with diameters in the range of from 0.3 to 10 μm.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of forming a carrier material composed of alumina hydrate as a base material. SOLUTION: A method of forming the carrier material suited to use in Fischer-Tropsch reactions includes forming a dispersion of first and second hydrated alumina materials in a liquid dispersant, such as an acid solution. The first alumina can be derived from an alkali aluminate, such as is formed in the Bayer reaction. The second hydrated alumina can be derived from high purity aluminum, such as via conversion to an alkoxide. The dispersion is spray dried to form particles which are heat treated to form a carrier material having low levels of impurities. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
Disclosed is a population of ceramic particles that includes a plurality of individual, free flowing particles. The plurality has a total weight and particle size distribution. The effective width of the distribution is the difference between the distribution's d95 and d5 particle sizes. The distribution's effective width exceeds 100 microns and includes three abutting and non-overlapping regions that include a first region, a second region, and a third region. The first region abuts the second region and the second region abuts the third region. The width of the second region is at least 25% of the effective width. The weight of particles in the second region does not exceed 15% of the plurality of particle's total weight. The weight of particles in the first region and the third region each exceed the weight of particles in the second region. Methods of making the populations of ceramic particles are also disclosed.
Abstract:
A thermal energy storage apparatus capable of storing large quantities of heat uses a plurality of energy storage zones having essentially the same thermal energy storage capacity per zone. The flow of a fluid into each zone is separately and independently controlled thereby creating a modular system that is capable of responding to rapid changes in the supply of and/or demand for thermal energy.
Abstract:
A carrier, which comprises non-platelet alumina and/or a bond material, has a surface area of at least 1 m2/g, a total pore volume and a pore size distribution such that at least 80 % of the total pore volume is contained in pores with diameters in the range of from 0.1 to 10 µm, and at least 80 % of the pore volume contained in the pores with diameters in the range of from 0.1 to 10 µm is contained in pores with diameters in the range of from 0.3 to 10 µm, and a process for the preparation of a carrier which comprises forming a mixture comprising: a) from 50 to 95 weight percent of a first particulate a- alumina having a median particle size (d50) of from 5 to 100 µm; b) from 5 to 50 weight percent of a second particulate a- alumina having a d50 which is less than the dso of the first particulate a-alumina and which is in the range of from 1 to 10 µm; and c) an alkaline earth metal silicate bond material; weight percent being based on the total weight of a-alumina in the mixture; and firing the mixture to form the carrier.
Abstract:
Disclosed is a population of ceramic particles that includes a plurality of individual, free flowing particles. The plurality has a total weight and particle size distribution. The effective width of the distribution is the difference between the distribution's d95 and d5 particle sizes. The distribution's effective width exceeds 100 microns and includes three abutting and non-overlapping regions that include a first region, a second region, and a third region. The first region abuts the second region and the second region abuts the third region. The width of the second region is at least 25% of the effective width. The weight of particles in the second region does not exceed 15% of the plurality of particle's total weight. The weight of particles in the first region and the third region each exceed the weight of particles in the second region. Methods of making the populations of ceramic particles are also disclosed.