In
this work, we present a new metal oxide semiconductor gas sensor
for detecting trimethylamine (TMA) by bimetal Au@Pt-modified α-Fe2O3 hollow nanocubes (NCs) as sensing materials.
The structure and morphological characteristics of Au@Pt/α-Fe2O3 were evaluated through multiple analyses, and
their gas-sensitive performance was investigated. Compared with the
pristine α-Fe2O3 NC sensor, the sensor
based on Au@Pt/α-Fe2O3 NCs exhibited faster
response time (5 s) and higher response (R
a/R
g = 32) toward 100 ppm TMA gas at a
lower temperature (150 °C). Furthermore, we also assessed the
Au@Pt/α-Fe2O3 NC sensor for detecting
the freshness of Larimichthys crocea which have been observed by headspace solid-phase microextraction
and gas chromatography–mass spectrometry. The high performance
of the Au@Pt/α-Fe2O3 NCs is attributed
to the special hollow morphology with a high specific surface area
(212.9 m2/g) and the synergistic effect of the Au@Pt bimetal.
The Au@Pt/α-Fe2O3 sensor shows promising
application prospects in estimating seafood freshness on the spot.
High-temperature solid looping cycles for carbon capture provide a number of benefits when coupled with fuel reforming because they may combine the fuel reactor where the fuel is decarbonized with the CO 2 sorption step in the capture cycle. The heat released in the carbonation reaction may be used to run the endothermic steam reforming occurring in the same reactor, leading to an overall autothermic reaction. Another benefit derived from the presence of a CO 2 sorbent is the shifting of the equilibrium to greater hydrogen yields. A very promising approach is the utilization of Li 4 SiO 4 because this sorbent does not present a cyclic degradation as pronounced as the traditional Ca-based sorbents. The extremely high cost of Li 4 SiO 4 may be overcome through the production of the sorbent from rice husk, a kind of agriculture waste, which provides the silica source. Furthermore, rice husk Li 4 SiO 4 exhibits better sorption properties compared to that of pure Li 4 SiO 4 because of the alkaline element content from rice husks. In the State Key Laboratory of Coal Combustion, the kinetics of this enhanced process has been characterized. Different configurations may be adopted to integrate this capture process in a precombustion process for enhanced hydrogen production and minimize the energy penalty associated with sorbent regeneration. A fixed bed system has been modeled to assess the energy requirements of the system and the available energy for integration. By application of the experimental results obtained for Li 4 SiO 4 kinetics, the developed model allows for the estimation of syngas compositions, production rate, and energy flows. This model represents an interesting tool for the assessment of further applications of the enhanced reforming of gaseous fuels through in situ carbon capture with Li 4 SiO 4 .
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