The process of sulfation during SO2 poisoning has been
found to have a promoting effect on the selective catalytic reduction
(SCR) activity of NO
x
by NH3 over CeO2, due to the generation of acid sites. However,
sulfation generally tends to inhibit the SCR activity of Ce-based
catalysts. This suggests that sulfation may have a dual character
on Ce-based SCR catalysts. To investigate this, CeO
x
/TiO2 (Ce/Ti) was employed in this study. The results
show that sulfation suppressed the reducibility and O storage ability
of Ce/Ti and reduced the content of surface Ce active sites, all of
which suppressed the SCR activity of Ce/Ti. However, sulfation also
generated new Brønsted acid sites on Ce/Ti, and the reactivity
of NH3 adsorbed on these Brønsted acid sites was almost
equal to that on Lewis acid sites. Due to this contradictory impact
of sulfation, Ce/Ti and S-Ce/Ti showed similar SCR activity at lower
temperatures (150–300 °C). Furthermore, because of the
relatively unstable nature of ionic NH4
+ adsorbed
on the newly generated Brønsted acid sites, the SCR activity
of S-Ce/Ti quickly decreased at higher temperatures (300–400
°C). Consequently, utilizing the advantages and bypassing the
disadvantages of sulfation can be a new strategy for designing Ce-based
SCR catalysts with excellent SCR performance.
The human world is a world of symbols, which originates from the natural physiological response of human body and forms the public behavior through common cognition. The use of symbols contributes to the communication mode of consciousness information expression. Decoration is a symbol in the world of colorful symbols, an indispensable and necessary part of life. In addition to keeping warm, protecting the body and beauty, it is also a form of human expression of emotion and self-expression, and also shows the features of all social classes. The Rukai nationality in Taiwan is an ethnic group without written language. The application of pattern implies the social class, customs and cultural context of the ethnic group. Based on the relevant literature records, field records, field interviews and comprehensive analysis, this paper discusses the pattern decoration of Rukai nationality from the perspective of semiotics: the nature, origin and significance of behavior of marks. It is hoped to arouse people's understanding of the traditional pattern decoration of the Rukai people in Taiwan, and to care about their traditional culture and inheritance.
The purpose of this paper is to study the revitalization of Qianyang Village in Jin'an District, Fuzhou City. The paper tries to embed Qianyang Village with the experience of Community Building in Taiwan, and at the same time puts forward sustainable design management strategy. This research is to organize and analyze several successful cases of community building in Taiwan, then transplant them into the community building strategy belonging to Qianyang Village, and combine the local characteristic cultural creativity, and at the same time, refine the residents' requirements and relevant suggestions.
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