搜索结果: 1-15 共查到“石油与天然气工程 SiO2”相关记录22条 . 查询时间(0.234 秒)
页岩具有极低的渗透率和极小的孔喉尺寸,传统封堵剂难以在页岩表面形成有效的泥饼阻止液相侵入,只有纳米级颗粒才能封堵页岩的孔喉,阻止液相侵入地层,维持井壁稳定,保护储层。采用硅烷偶联剂KH570对纳米SiO2进行超声表面改性,引入乙烯基功能基团,80℃下使其与温敏性单体N-异丙基丙烯酰胺(NIPAm)、亲水性单体丙烯酸(AA)共聚,通过调节NIPAm、AA摩尔比制得不同最低共溶温度(LCST)值的温敏...
纳米减阻技术是针对高压欠注问题研发的一项有效新技术，其减阻机理尚不十分明确。疏水纳米材料抑制黏土的膨胀是纳米减阻机理之一。采用一种适用于疏水纳米粉体防膨率的测试方法，测试了多种疏水纳米SiO2对黏土的防膨率。采用吸附实验和扫描电子显微镜（SEM）研究了纳米颗粒在岩心表面的吸附特征。防膨实验结果显示，所测疏水纳米SiO2大多具有一定的防膨作用，但防膨效果差异较大。纳米SiO2的表面修饰剂以及纳米粉体...
Fischer-Tropsch Reaction over Bimodal Porous Ru/SiO2 Catalysts Prepared by Alkoxide Method
Alkoxide method Bimodal pore structure Fischer-Tropsch reaction Particle size Ruthenium catalyst
2010/9/8
Bimodal porous Ru/SiO2 catalysts for the Fischer-Tropsch reaction were prepared by modifying the surface of macro-porous silica with Ru–SiO2 prepared by the alkoxide method. The Ru particle size estim...
Performance of Ba-doped Ir/WO3-SiO2 Catalyst for Selective Catalytic Reduction of NOx with CO in Diesel Exhaust
Nitric oxide Selective reduction Carbon monoxide Ammonia Iridium catalyst
2009/8/4
Ba-doped Ir/WO3-SiO2 catalyst has high activity and good durability for the selective catalytic reduction of NO with CO in the presence of O2 (CO-SCR). The performance of this catalyst was investigate...
Effects of Ru Precursors on Activity of Ru-SiO2 Catalysts Prepared by Alkoxide Method in Fischer-Tropsch Synthesis
Alkoxide method Fisher-Tropsch reaction Ruthenium precursor
2009/8/4
Ru-SiO2 catalysts with uniform structure were prepared by the alkoxide method using various Ru precursors, and used to catalyze the Fischer-Tropsch (F-T) synthesis in the slurry phase under the react...
Catalytic Performance of Monolithic Ir/SiO2 Based Catalysts for Selective Reduction of NO with CO
Nitric oxide Selective reduction Carbon monoxide Iridium catalyst
2009/8/4
Ir/SiO2, Ir/WO3-SiO2 and Ba doped Ir/WO3-SiO2 powder catalysts have high activity for the selective reduction of NO with CO in the presence of O2 (CO-SCR). The present study investigated the activity...
Preparation of Highly Active Co/SiO2 Fischer-Tropsch Synthesis Catalyst with Chelating Agents: Effect of Chelating Agents on Structure of Co Species during Preparation Steps
Fischer-Tropsch synthesis Cobalt catalyst Chelating agent Cobalt silicate
2009/7/28
The present study investigated the structure of Co species formed during the preparation of Co/SiO2 Fischer-Tropsch synthesis (FTS) catalysts with an aqueous Co nitrate solution modified with chelati...
Effects of Pore Size of Ru-SiO2 Catalysts Prepared by Alkoxide Method on Fischer-Tropsch Reaction
Alkoxide method Fischer-Tropsch reaction Particle size
2009/7/28
Uniform pore sizes of 10 wt%Ru-SiO2 catalysts prepared by the alkoxide method were varied in the range of 4-8 nm, by adding formamide (FA) at the sol-gel preparation stage. The prepared catalysts were...
TiO2 Promoted Co/SiO2 Catalysts for Fischer-Tropsch Synthesis
Fisher-Tropsch synthesis Cobalt catalyst Titania Silica Syngas
2009/7/28
The addition of small amount of TiO2 to silica supported cobalt catalysts significantly increased the dispersion of cobalt and Co metallic surface area, resulting in the remarkable enhancement of the ...
Bimodal Porous Co-Ir-SiO2 Catalysts Prepared by Sol-gel Process with Alkoxide for Fischer-Tropsch Synthesis
Alkoxide Bimodal pore structure Cobalt catalyst Fischer-Tropsch synthesis
2009/7/28
Bimodal porous catalysts were prepared by modifying the surface of macro-porous silica (Q-10, Q-30 and Q-50) with 20 wt%Co-0.5 wt%Ir-SiO2 prepared by the alkoxide method, and used for the Fischer-T...
Effect of SiO2/Al2O3 Ratio and Crystalline Structure of Zeolite on Hydrogenation and Hydrodesulfurization over Pt-Pd Catalyst Supported on USY Zeolite
Palladium platinum catalyst USY zeolite Desulfurization Hydrogenation
2009/7/27
Effects of the carrier characteristics were studied on the catalytic properties of Pt-Pd-supported USY zeolites in the hydrogenation of tetralin and the hydrodesulfurization of 4,6-dimethyldibenzothio...
Hydrogenation of Naphthalene over Pd/TiO2-SiO2 Catalysts
Naphthalene hydrogenation Supported palladium catalyst Hydrogenation catalyst
2009/7/24
TiO2-SiO2 supports were prepared by impregnation of Ti(OCH(CH3)2)4 on SiO2. These supports were characterized by use of BET surface area and XRD. Pd catalysts supported on TiO2-SiO2 binary oxides show...
Gasification of Cellulose over Rh/CeO2/SiO2 Catalysts: Combustion of Coke and Reforming of Tar
Cellulose Biomass Gasification Rhodium catalyst Cerium oxide catalyst Synthesis gas
2009/7/24
The conventional methods for biomass gasification to hydrogen and synthesis gas are carried out at high temperature. Recently Rh/CeO2 based catalysts has been shown to be very effective for the catal...
Rh/SiO2 Catalysts for Selective Reduction of NO with H2 in the Presence of SO2 and O2
Nitrogen monoxide Selective reduction Hydrogen Rhodium catalyst
2009/7/23
Rh/SiO2, as well as Ir/SiO2, catalysts showed excellent activity for NO reduction with H2 in the presence of O2 and SO2. In particular, the coexistence of O2 and SO2 was essential for NO reduction to...
Fischer-Tropsch Synthesis over Metal-promoted Co-Ir-SiO2 Catalysts Prepared by the Alkoxide Method
Additive Alkoxide method Cobalt catalyst Fischer-Tropsch reaction
2009/7/23
A series of metal-promoted 20 wt%Co-0.5 wt%Ir-SiO2 catalysts was prepared by the alkoxide method, and the effects of additives (MOx; M = K, Cr, Al, Ce, La, and Mn) on the catalysis of Fischer-Tropsch...