摘要:
1-Ethers may be cracked over untreated γ-alumina having a pore volume of more than 1.0 cc/g and an average pore diameter of more than 150 angstroms (Å) at a temperature from 250 to 350° C. and a pressure from 10 to 200 kPa at high conversions and good selectivity to produce the corresponding 1-alkene. The process is particularly useful to produce 1-octene from 1-methoxyoctane.
摘要:
Reduction of fouling in a thermal process for treating feed streams comprising naphtha, pyrolysis oils or a mixture thereof said feed stream having a combined olefinic content from 10 to 50 weight % and the balance inert hydrocarbons at a temperature from 100° C. to 300° C. which comprises decreasing the amount of carbon steel in the apparatus contacting said feed stream and increasing the amount of stainless steel.
摘要:
The present invention provides a continuous process for the oxidative dehydrogenation of ethane to ethylene using a mixed oxide catalyst supported onto a ceramic membrane by supplying an oxygen containing gas (air or pure oxygen) and pure ethane to the opposite sides of the membrane, so that the paraffin and the oxygen do not directly mix in the reactor.
摘要:
The present invention provides a continuous process for the oxidative dehydrogenation of ethane to ethylene using a mixed oxide catalyst supported onto a ceramic membrane by supplying an oxygen containing gas (air or pure oxygen) and pure ethane to the opposite sides of the membrane, so that the paraffin and the oxygen do not directly mix in the reactor.
摘要:
Anode catalysts for conversion of hydrocarbon feeds in solid oxide fuel cell membrane reactors. An anode catalyst may be a mixture of a metal with a metal oxide, for example a mixture of copper or copper-nickel alloy or copper-cobalt alloy with Cr2O3. Mixed oxides can be prepared by dissolving into water soluble salts of the different metals, chelating the metal ions with a chelating agent, neutralizing the solution, removing water by evaporation to form a gel which then is dried, and finally heating the dried gel to form a mixed oxide of the different metals. The chelating agent can be citrate ions, and ammonia can be added to the solution until the pH of the solution is about 8. The mixed oxide so formed then is reduced, for example by hydrogen, to form a composite comprising the metal (Cu, Cu—Co, Cu—Ni) and metal oxide, here Cr2O3. Typically, the composite oxides so formed comprise approximately spherical nanoparticles, and the reduced composites are nanoparticles comprising very small particles of the metal within a network of the oxide, Cr2O3.
摘要翻译:用于在固体氧化物燃料电池膜反应器中转化烃进料的阳极催化剂。 阳极催化剂可以是金属与金属氧化物的混合物,例如铜或铜 - 镍合金或铜 - 钴合金与Cr 2 O 3的混合物。 混合氧化物可以通过将不同金属的水溶性盐溶解,用螯合剂螯合金属离子,中和溶液,通过蒸发除去水以形成凝胶,然后干燥,最后加热干燥的凝胶形成 不同金属的混合氧化物。 螯合剂可以是柠檬酸根离子,并且可以向溶液中加入氨,直到溶液的pH为约8.然后如此形成的混合氧化物例如由氢还原形成包含金属(Cu, Cu-Co,Cu-Ni)和金属氧化物,这里是Cr 2 O 3。 通常,如此形成的复合氧化物包含近似球形的纳米颗粒,并且还原的复合材料是在氧化物Cr 2 O 3的网络内包含非常小的金属颗粒的纳米颗粒。
摘要:
The presence of complexes predominantly of iron and one or more of chromium, nickel and oxygen and mixtures thereof on the surface of a stainless steel exposed to a feed stream containing hydrocarbons at elevated temperatures tends to give rise to decomposition products of the hydrocarbon. The amount of iron complexes may be reduced in situ without stopping the process by adding to the feed stream 0.001 to 1 vol % a silane and optionally from 0 to 500 ppm based on the weight of the feed stream of sulphur or a sulphur containing compound.
摘要:
The oligomerization of ethylene using a chromium catalyst having a heteroatomic ligand may be used to provide oligomerization products that are selective towards hexene and/or octene. However, such processes also typically produce some polymer as an undesirable by product. The present invention is directed towards improvements in the selective oligomerization of ethylene.
摘要:
Ethylene is selectively oligomerized in a continuously stirred tank reactor (CSTR) that is preferably operated in an isothermal manner using a chromium catalyst. The undesired formation of by-product polyethylene is mitigated by contacting the ethylene with hydrogen prior to adding the ethylene to the reactor and feeding the ethylene and hydrogen via a common feed port.
摘要:
The present invention provides a process for the manufacture of an efficient and robust catalyst for the oxidative dehydrogenation of paraffins to olefins, preferably lower C2-4 paraffins. The present invention provides a process for the preparation of an oxidative dehydrogenation catalyst of C2-4 paraffins to olefins comprising comminuting: from 10 to 99 weight % of a mixed oxide catalyst of the formula VxMoyNbzTemMenOp, wherein Me is a metal selected from the group consisting of Ta, Ti, W, Hf, Zr, Sb and mixtures thereof; with from 90 to 1 weight % of an inert matrix selected from oxides of titanium, zirconia, aluminum, magnesium, yttria, lantana, silica and their mixed compositions or a carbon matrix to produce particles having a size from 1 to 100 microns and forming the resulting particles into pellets having a size from 0.1 to 2 mm.
摘要:
The present invention provides a process for the oxidative dehydrogenation of a paraffin such as ethane to the corresponding alkene such as ethylene in which the alkane is contacted with a bed of oxidative dehydrogenation catalyst having an enhanced labile oxygen content in the crystal structure on an inert support optionally with a regenerable metallic oxidant composition in the absence of a gaseous feed containing oxygen.