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This Special Issue on "New Trends on the Combustion Processes in Spark Ignition Engines" contains nine papers on new developments on Internal Combustion (IC) engines aiming to enhance their efficiency, leading to the reduction of fossil CO2 and other gaseous pollutants. It is divided into two parts. In the initial part, the focus in on fuels, with four papers discussing the use of biofuels and other alternative fuels that can be used in different types of IC Engines. Additionally, conventional fuels are tested in order to evaluate their optimal use in new downsizing high-boost engines. A revision paper on alternative fuels is also included. The second part involves the study and improvement of engine combustion diagnostics as well as the presentation of an alternative type of propulsion system.

iso-octane --- n-heptane --- toluene --- surrogate fuels --- burning velocity --- combustion bomb --- octane number --- knocking --- spark-ignition --- performance --- knock sensor --- fuel economy --- vehicle acceleration --- spark ignition --- calorimeter --- thermal energy --- spark plug --- natural gas engine --- Biodiesel --- diesel engines --- diethyl ether --- ethanol --- biofuels --- emissions --- fuels --- synthetic fuels --- internal combustion engine --- alternative fuels --- lipid bio-oils --- pyrogasoline --- exhaust emissions and spark-ignition engine --- combustion optimization --- cylinder-to-cylinder variation --- cycle-to-cycle variation --- fuel consumption --- 0D-1D engine modeling --- experiments --- axial engines --- wobble plate --- opposed piston engine --- uniflow scavenging --- variable compression ratio --- variable valve timing --- downsizing --- downspeeding --- multifuel potential --- Ion current --- cylinder pressure --- cooperative combustion diagnosis and control --- field-programmable gate array --- artificial neural network

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Catalyst lifetime represents one of the most crucial economic aspects in industrial catalytic processes, due to costly shutdowns, catalyst replacements, and proper disposal of spent materials. Not surprisingly, there is considerable motivation to understand and treat catalyst deactivation, poisoning, and regeneration, which causes this research topic to continue to grow. The complexity of catalyst poisoning obviously increases along with the increasing use of biomass/waste-derived/residual feedstocks and with requirements for cleaner and novel sustainable processes. This book collects 15 research papers providing insights into several scientific and technical aspects of catalyst poisoning and deactivation, proposing more tolerant catalyst formulations, and exploring possible regeneration strategies.

cyclic operation --- n/a --- nickel catalysts --- regeneration --- Cu/SSZ-13 --- syngas --- NH3-SCR --- oxysulfate --- Ni-catalyst --- MW incinerator --- iso-octane --- hydrogenation --- dry reforming of methane --- oxysulfide --- Co-Zn/H-Beta --- Low-temperature catalyst --- Rh catalysts --- deactivation --- vanadia species --- SO2 poisoning --- vehicle emission control --- barium carbonate --- sodium ions --- sulfur deactivation --- tetragonal zirconia --- sulfur poisoning --- Liquefied natural gas --- water --- deactivation by coking --- phase stabilization --- catalyst --- NO removal --- physico-chemical characterization --- octanol --- SEM --- aluminum sulfate --- oxygen storage capacity --- unusual deactivation --- diesel --- nitrous oxide --- exhaust gas --- over-reduction --- poisoning --- catalyst deactivation --- ammonium sulfates --- CO2 reforming --- SO3 --- Rh --- in situ regeneration --- copper --- V2O5–WO3/TiO2 catalysts --- palladium sulfate --- Selective Catalytic Reduction (SCR) --- biogas --- thermal stability --- phthalic anhydride --- octanal --- natural gas --- sulfur-containing sodium salts --- washing --- coke deposition --- vanadia-titania catalyst --- CPO reactor --- homogeneous catalysis --- NOx reduction by C3H8 --- nitrogen oxides --- effect of flow rate --- DeNOx --- catalytic methane combustion --- deactivation mechanism --- TEM --- catalyst durability --- V2O5-WO3/TiO2 catalysts