Abstract:Northwest China includes Xinjiang Ugyur Autonomous Region, Qinghai Province, Gansu Province, Ningxia Hui Autonomous Region and Shaanxi Province, covering 308×10 4 km 2 . It is located in the warm-temperate zone and the climate is arid or semi-arid. Precipitation is very scarce but evaporation is extremely high. The climate is dry, the water resources are deficient, the eco-environment is fragile, and the distribution of water resources is uneven. In this region, precipitation is the only input, and evaporation… Show more
“…The hydrogen recovery rate is affected by the ammonia feed flow rate and tends to decrease with increasing ammonia feed flow rate. 12,54,55 In this study, the ratio of feed flow rate (mL min −1 ) to membrane area (cm 2 ) (F/A ratio) was 11.4 mL cm −2 min −1 , i.e. , ∼70% of that in a previous study.…”
Section: Resultsmentioning
confidence: 62%
“…The hydrogen recovery rate is affected by the ammonia feed ow rate and tends to decrease with increasing ammonia feed ow rate. 12,54,55 In this study, the ratio of feed ow rate (mL min −1 ) to membrane area (cm 2 ) (F/A ratio) was 11.4 mL cm −2 min −1 , i.e., ∼70% of that in a previous study. 30 We achieved ∼99% ammonia conversion and 93.3% hydrogen recovery, which are higher values than those reported in a previous study.…”
Section: Ammonia Decomposition Test Using Membrane Reactormentioning
“…The hydrogen recovery rate is affected by the ammonia feed flow rate and tends to decrease with increasing ammonia feed flow rate. 12,54,55 In this study, the ratio of feed flow rate (mL min −1 ) to membrane area (cm 2 ) (F/A ratio) was 11.4 mL cm −2 min −1 , i.e. , ∼70% of that in a previous study.…”
Section: Resultsmentioning
confidence: 62%
“…The hydrogen recovery rate is affected by the ammonia feed ow rate and tends to decrease with increasing ammonia feed ow rate. 12,54,55 In this study, the ratio of feed ow rate (mL min −1 ) to membrane area (cm 2 ) (F/A ratio) was 11.4 mL cm −2 min −1 , i.e., ∼70% of that in a previous study. 30 We achieved ∼99% ammonia conversion and 93.3% hydrogen recovery, which are higher values than those reported in a previous study.…”
Section: Ammonia Decomposition Test Using Membrane Reactormentioning
“…Minimum α H 2 /NH 3 requirements to achieve H 2 purity higher than 99.9% are very similar. For most lab-scale studies reported for ammonia decomposition in a Pd-coated membrane reactor, α H 2 /NH 3 is not reported because no NH 3 is detected in the permeate side, 22,24,25,78 indicating that although there is a minimum requirement of α H 2 /NH 3 on the order of 10 3 , in most of the reported cases this value is easily achieved for common H 2 permselective materials. This is the case of the membrane studied in this work, for which pure H 2 is obtained in the permeate in all experiments.…”
The production of high-purity, pressurized hydrogen from ammonia decomposition in a membrane catalytic reactor is a feasible technology. However, because of the multiple coupled parameters involved in the design of...
“…This result suggests that the use of an intermediate step to eliminate the H 2 , or the use of a H 2 -selective membrane reactor, could be beneficial due to the reduction of the inhibition by H 2 and thus increasing the conversion per pass. The use of membrane reactors has been reported for NH 3 decomposition of diluted [33,34] or concentrated [35] ammonia streams, and it is claimed higher conversions to H 2 using membranes than without membranes.…”
Section: Inhibiting Effect Of Reaction Productsmentioning
A catalyst of Ni supported on alumina coated monolith has been prepared, characterized and tested in NH 3 decomposition. The characterization of the catalyst by XPS and TPR showed that there is no formation of aluminates after catalyst use. It is studied the effect of the space velocity, by varying the feed flow rate and the catalyst's length. Some evidences are shown about the reaction inhibition by produced H 2 and about the reasons for the better performance of the monolith than packed bed catalyst.
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