Fixed-bed continuous flow microreactor

Catalyst Evaluation. The powdered molecular sieves were evaluated following the treatment described above, without further activation. The 1-hexene isomerization and Cg aromatic isomerization tests were conducted in tubular, fixed bed, continuous flow microreactors. The catalyst bed contained one gram molecular sieve powder and one to three grams of similarly sized quartz chips used as diluent. The reactor was heated to the chosen reaction temperatures in a fluidized sand bath, and the reaction temperature was monitored by a thermocouple located m the catalyst bed. Typical runs lasted 3 to 5 hours during which samples were collected every 30 minutes. 

Catalytic properties were examined in a fixed bed continuous flow microreactor at atmospheric pressure with Hg resp. N2 as carrier gases (flow rate 10 1 h applying the conversion of ethylbenzene and the isomerization of m-xylene as probe reactions on one gram of the binder-free zeolite (0.35 - 1.0 mm). The shape selectivity was tested as described elsewhere [7]. ... 

All the experimental runs were performed in a continuous fixed bed stainless steel microreactor under the following conditions T=573-643 K, P=l-40 bar time factor x=0.2-10 3 gcath/gsBB- The catalyst was activated overnight in situ at 773 K under air flow before reaction and cooled down to the reaction temperature in N2. After pressurization at the desired... 

Methanol combustion catalytic tests were performed in a continuous-flow fixed-bed reactor, using 0.1 g of catalyst fluted with an inert glass powder. A reactant mixture of 0.7 vol. % methanol, 10 vol. % O2, the rest being helium and a gas hour space velocity of 7.6x10 mol h gcat were used. PROX reaction was carried out in a continuous-flow microreactor filled with catalyst (0.05 g) diluted with an inert glass powder. The gas composition (total flow rate 80 ml/min)was 1% of CO, 1% of O2, the rest being H2. 

The catalytic activity of SBA and AISBA samples toward cumene cracking were tested in a continuous flow fixed-bed microreactor system with helium (25 mL min 1) as carrier gas. The catalyst load for the tests was 100 mg and the catalyst was preheated at 573 K under helium flow for 3 h. For the reaction, a stream of cumene vapor in helium was generated using a saturator at room temperature. The reaction products were analyzed by gas chromatography. 

Catalytic testa have been carried out in a continuous-flow fixed-bed glass microreactor at atmospheric pressure equipped with on-line gas chromatographs. Other details on the apparatus were reported previously [6,7], Unless otherwise indicated, the standard reaction conditions were 0.8% 1-butene, 20% 02 and 20% H20 in helium. The total flow at STP was 3,6 LA with 2,5 g of catalyst. 

NSSTK and SSITK experiments were performed with an atmospheric flow system using either a tubular quartz microreactor (70 mg of catalyst) or a catalytic DRIFT cell from Spectratech, allowing the gases to flow through a fixed bed of catalyst pellets (about 30 mg) and able to be heated up to 1173 K. The gas composition was continuously monitored at the reactor outlet by online mass spectrometer and the surface composition was investigated by a FT-BR. spectrometer (Nicolet 550) with one spectrum recorded per second In all cases, the catalyst was pre-treated with He at 1013 K for 40 min. The reacting feed was composed of 10 vol.% methane ( CHj, CHj or CD4) and 90 vol.% He with a total flow rate of 24 ml/min. The reaction was carried out at 1 atm and 1013 K. Ar was used as an inert tracer. 

The hydrodechlorination of CCI4 (Merck GR batch n° k22643522605) was performed in a continues flow, fixed bed glass microreactor, working at atmospheric pressure, with... 

Apparatus. The catalytic conversion was studied in a continuous flow quartz microreactor with a fixed-bed of diluted catalysts. The reaction conditions are reported in Table 1. After an experimental run (about 3 to 4 hours), the tar on the catalytic bed was determined by taking the difference in weight of the reactor before and after placing it in a furnace set at 500 C in the presence of air. The reaction products were analyzed by GC and GC/MS (Table 1). 

Kinetic studies were performed in a continuous fixed-bed microreactor operated at atmospheric pressure. The reactant feed rate was controlled by mass flow controllers (Brooks 5850E). Both inlet and outlet gas compositions were quantitatively analyzed using an on-line quadrupole mass spectrometer (Balzers GAM 445). 

Catalytic experiments were performed in a continuous flow fixed bed microreactor using SiC diluted catalyst to obtain predetermined total volume of catalyst bed (i.e., GHSV, h ). The feed composition comprises propane, oxygen, and, in some cases, steam or ammonia. In the case of mixed oxide catalyst and Ga-ZSM-5, the condensable products (acrylic and acetic acids, acrolein, acetone, acrylonitrile,... 

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